Let A CR be the set of integers, viewed as a subspace of the reals, and let X be the quotient space R/A obtained by collapsing A to a point. Show that X ≈ √₂S¹; that is, X is homeomorphic to a wedge sum of countably infinitely many circles.
Let A CR be the set of integers, viewed as a subspace of the reals, and let X be the quotient space R/A obtained by collapsing A to a point. Show that X ≈ √₂S¹; that is, X is homeomorphic to a wedge sum of countably infinitely many circles.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Let \( A \subset \mathbb{R} \) be the set of integers, viewed as a subspace of the reals, and let \( X \) be the quotient space \( \mathbb{R} / A \) obtained by collapsing \( A \) to a point. Show that \( X \cong \bigvee_{\mathbb{Z}} S^1 \); that is, \( X \) is homeomorphic to a wedge sum of countably infinitely many circles.
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